Drilling-fixing integrated device and method for yolk coal terrane

Abstract

The invention discloses a drilling-fixing integrated device for a yolk coal terrane. The drilling-fixing integrated device for the yolk coal terrane comprises a drilling rod, wherein the drilling rod is in transmission connection with an outer power mechanism; the device also comprises an extruding helicoid with a round-table-shaped outline, one end with a bigger diameter of the extruding helicoid is a back end and is fixedly connected to the front end of the drilling rod, one end with a smaller diameter of the extruding helicoid is a front end and is provided with a drill bit and the diameter of the drill bit is the same as the diameter of the front end of the extruding helicoid. The diameter of the front end of the extruding helicoid is small and the diameter of the back end of the sameis big, so that the coal on the periphery of the drilled hole can be extruded in the drilling process, the problem of collapse because the coal layer is very soft is solved, the hole-forming rate of the drilled hole is improved and the developing cost is reduced; and therefore, the device provided by the invention provides important guarantees to follow-up gas extraction and coal layer gas development. The invention also provides a hole drilling method using the drilling-fixing integrated device for the yolk coal terrane; the hole drilling method can realize hole drilling, extrusion and hole expansion, diameter expansion and support of the drilled hole in the process of primarily drilling, thereby extremely improving the hole-forming rate of the drilled hole of the yolk coal terrane.

Description

technical field [0001] The invention relates to the technical field of coal bed gas development, in particular to the drilling technology of soft coal rock formations. Background technique [0002] The basic components of coalbed methane and gas are the same, and the main components of both are methane gas. From the perspective of coal mine safety, gas is a harmful gas. In order to avoid various accidents caused by gas in the process of coal mining, people have tried various technical measures such as hydraulic extrusion, hydraulic fracturing, loose blasting, and mining protective layers. Among them, the underground kilometer-long drilling technology is playing an increasingly important role in underground gas control due to its advantages of small number of drilling holes, large impact range, and less engineering work. From the perspective of coalbed methane development, methane gas is a kind of clean energy. In order to utilize this energy, people have adopted various te...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a drilling-solid integrated device for soft coal rock formations to solve the problem of hole collapse in the process of drilling into holes in soft coal rock formations

Images